In deep cooking pan , add oil, when oil is hot add curry leaves and mustard seeds, when they splutter , add onion and green chillies, fry to golden brown, then add all the masala powder and ginger garlic paste, fry till oil separate from masala, then add green peas and chopped tomato's and cook for 8 minutes, keep smashing tomatos in between, now add potato's and salt mix well, then add 2 cup of water mix it again and cook for another 8 to 10 minutes.